Commit | Line | Data |
---|---|---|
d2acc347 HX |
1 | /* tunnel4.c: Generic IP tunnel transformer. |
2 | * | |
3 | * Copyright (C) 2003 David S. Miller (davem@redhat.com) | |
4 | */ | |
5 | ||
6 | #include <linux/init.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/mutex.h> | |
9 | #include <linux/netdevice.h> | |
10 | #include <linux/skbuff.h> | |
50fba2aa HX |
11 | #include <net/icmp.h> |
12 | #include <net/ip.h> | |
d2acc347 HX |
13 | #include <net/protocol.h> |
14 | #include <net/xfrm.h> | |
15 | ||
16 | static struct xfrm_tunnel *tunnel4_handlers; | |
c0d56408 | 17 | static struct xfrm_tunnel *tunnel64_handlers; |
d2acc347 HX |
18 | static DEFINE_MUTEX(tunnel4_mutex); |
19 | ||
358352b8 PE |
20 | static inline struct xfrm_tunnel **fam_handlers(unsigned short family) |
21 | { | |
22 | return (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers; | |
23 | } | |
24 | ||
c0d56408 | 25 | int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family) |
d2acc347 HX |
26 | { |
27 | struct xfrm_tunnel **pprev; | |
28 | int ret = -EEXIST; | |
29 | int priority = handler->priority; | |
30 | ||
31 | mutex_lock(&tunnel4_mutex); | |
32 | ||
358352b8 | 33 | for (pprev = fam_handlers(family); *pprev; pprev = &(*pprev)->next) { |
d2acc347 HX |
34 | if ((*pprev)->priority > priority) |
35 | break; | |
36 | if ((*pprev)->priority == priority) | |
37 | goto err; | |
38 | } | |
39 | ||
40 | handler->next = *pprev; | |
41 | *pprev = handler; | |
42 | ||
43 | ret = 0; | |
44 | ||
45 | err: | |
46 | mutex_unlock(&tunnel4_mutex); | |
47 | ||
48 | return ret; | |
49 | } | |
50 | ||
51 | EXPORT_SYMBOL(xfrm4_tunnel_register); | |
52 | ||
c0d56408 | 53 | int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family) |
d2acc347 HX |
54 | { |
55 | struct xfrm_tunnel **pprev; | |
56 | int ret = -ENOENT; | |
57 | ||
58 | mutex_lock(&tunnel4_mutex); | |
59 | ||
358352b8 | 60 | for (pprev = fam_handlers(family); *pprev; pprev = &(*pprev)->next) { |
d2acc347 HX |
61 | if (*pprev == handler) { |
62 | *pprev = handler->next; | |
63 | ret = 0; | |
64 | break; | |
65 | } | |
66 | } | |
67 | ||
68 | mutex_unlock(&tunnel4_mutex); | |
69 | ||
70 | synchronize_net(); | |
71 | ||
72 | return ret; | |
73 | } | |
74 | ||
75 | EXPORT_SYMBOL(xfrm4_tunnel_deregister); | |
76 | ||
77 | static int tunnel4_rcv(struct sk_buff *skb) | |
78 | { | |
79 | struct xfrm_tunnel *handler; | |
80 | ||
50fba2aa HX |
81 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
82 | goto drop; | |
83 | ||
d2acc347 HX |
84 | for (handler = tunnel4_handlers; handler; handler = handler->next) |
85 | if (!handler->handler(skb)) | |
86 | return 0; | |
87 | ||
50fba2aa HX |
88 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
89 | ||
90 | drop: | |
d2acc347 HX |
91 | kfree_skb(skb); |
92 | return 0; | |
93 | } | |
94 | ||
c0d56408 KM |
95 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
96 | static int tunnel64_rcv(struct sk_buff *skb) | |
97 | { | |
98 | struct xfrm_tunnel *handler; | |
99 | ||
baa2bfb8 | 100 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
c0d56408 KM |
101 | goto drop; |
102 | ||
103 | for (handler = tunnel64_handlers; handler; handler = handler->next) | |
104 | if (!handler->handler(skb)) | |
105 | return 0; | |
106 | ||
107 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
108 | ||
109 | drop: | |
110 | kfree_skb(skb); | |
111 | return 0; | |
112 | } | |
113 | #endif | |
114 | ||
d2acc347 HX |
115 | static void tunnel4_err(struct sk_buff *skb, u32 info) |
116 | { | |
117 | struct xfrm_tunnel *handler; | |
118 | ||
119 | for (handler = tunnel4_handlers; handler; handler = handler->next) | |
120 | if (!handler->err_handler(skb, info)) | |
121 | break; | |
122 | } | |
123 | ||
99f93326 PE |
124 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
125 | static void tunnel64_err(struct sk_buff *skb, u32 info) | |
126 | { | |
127 | struct xfrm_tunnel *handler; | |
128 | ||
129 | for (handler = tunnel64_handlers; handler; handler = handler->next) | |
130 | if (!handler->err_handler(skb, info)) | |
131 | break; | |
132 | } | |
133 | #endif | |
134 | ||
d2acc347 HX |
135 | static struct net_protocol tunnel4_protocol = { |
136 | .handler = tunnel4_rcv, | |
137 | .err_handler = tunnel4_err, | |
138 | .no_policy = 1, | |
4597a0ce | 139 | .netns_ok = 1, |
d2acc347 HX |
140 | }; |
141 | ||
c0d56408 KM |
142 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
143 | static struct net_protocol tunnel64_protocol = { | |
144 | .handler = tunnel64_rcv, | |
99f93326 | 145 | .err_handler = tunnel64_err, |
c0d56408 | 146 | .no_policy = 1, |
b0970c42 | 147 | .netns_ok = 1, |
c0d56408 KM |
148 | }; |
149 | #endif | |
150 | ||
d2acc347 HX |
151 | static int __init tunnel4_init(void) |
152 | { | |
153 | if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) { | |
154 | printk(KERN_ERR "tunnel4 init: can't add protocol\n"); | |
155 | return -EAGAIN; | |
156 | } | |
c0d56408 KM |
157 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
158 | if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) { | |
159 | printk(KERN_ERR "tunnel64 init: can't add protocol\n"); | |
160 | inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP); | |
161 | return -EAGAIN; | |
162 | } | |
163 | #endif | |
d2acc347 HX |
164 | return 0; |
165 | } | |
166 | ||
167 | static void __exit tunnel4_fini(void) | |
168 | { | |
c0d56408 KM |
169 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
170 | if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6)) | |
171 | printk(KERN_ERR "tunnel64 close: can't remove protocol\n"); | |
172 | #endif | |
d2acc347 HX |
173 | if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP)) |
174 | printk(KERN_ERR "tunnel4 close: can't remove protocol\n"); | |
175 | } | |
176 | ||
177 | module_init(tunnel4_init); | |
178 | module_exit(tunnel4_fini); | |
179 | MODULE_LICENSE("GPL"); |